The Limbo Connection(1978)

Mark Omney is a struggling writer, and has a drink problem; his wife Clare is more successful as a journalist. After a dinner-party they host ends badly, they part company the next morning on separate business. Clare becomes ill after an interview assignment, and crashes her car; meanwhile Mark meets former girlfriend Annabelle in the pub. After Clare is taken to a private clinic nearby by Good Samaritans, Mark finds she seems to have mysteriously disappeared